pgsql: Docs: add example clarifying use of nested JSON containment.

Docs: add example clarifying use of nested JSON containment.

Show how this can be used in practice to make queries simpler and more
flexible. Also, draw an explicit contrast to the existence operator,
which doesn't work that way.

Peter Geoghegan and Tom Lane

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/9a1a22980d3650e6e232bc4423ec74bfc6d0e7be

Modified Files
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doc/src/sgml/json.sgml | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)

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